%0 Journal Article %A Earl Berkson %T Marcinkiewicz multipliers of higher variation and summability of operator-valued Fourier series %J Studia Mathematica %D 2014 %P 123-155 %V 222 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4064/sm222-2-2/ %R 10.4064/sm222-2-2 %G en %F 10_4064_sm222_2_2